Hello fellow unable to print their homegroup passworders.
My workaround was to use another computer (A) with the password on the screen and type the password in the other computer (B) while I look on the screen of computer A. It worked great.
To finally print the password, I used Snipping Tool which I believe is a Desktop App. Using this app, I drew a rectangle around what I wanted to print and voila - it printed. It is a powerful tool and perfect for situations like this. It even has buttons built in to email your screen snip, save as an image, etc.
Also, for ultimate security, you could write the password down on a piece of paper using pen, pencil, crayon, sharpie, colored pencil, charcoal, or paint. Or type it into a text document, a Word file, or using any text editor, or your smart phone, and maybe even write it in a special coded way so only you can understand it. Then put it in a filing cabinet, or your drawer full of DVD's or PlayStation or Xbox games, since you might actually need it while using one of those.
It probably sounds silly - all this obvious advice. It just seems this would be a good workaround and the password is only needed once for most people.